Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a726f4433143d0…

MALICIOUS

PDF

48.8 KB Created: 2020-10-11 10:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 113af07aa920bf7eb85969db0d330aa8 SHA-1: a656e6de2dec136a0cd2622ac8ab18f0f75c50f4 SHA-256: 84a726f4433143d0867120324c8b26dad161ea5817e28b3dfaa4c071ff067cc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/pify?keyword=great+america+haunt+shooting In PDF document text
    • http://files.wonderfulthings.org.uk/uploads/1/3/0/8/130813514/2613651.pdfIn PDF document text
    • http://files.down-the-block.com/uploads/1/3/0/7/130775893/6cbc1004bf3.pdfIn PDF document text
    • http://basekitof.ryangardnerjewelry.com/uploads/1/3/1/3/131383483/fifis.pdfIn PDF document text
    • http://files.hawaiijudaica.com/uploads/1/3/2/6/132682204/vameja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aa3b3873-fe34-4d23-b367-2334d79f270f/joxusomuwikegizovunum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68048a6-9b09-4c3b-92f7-ecef9d511944/16449587801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f9702a-3720-4bef-9b88-f3e14367fc9b/86849840564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353d537c-b0b1-4272-aa01-4335b08f41d0/58001390709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b35cd4f-75a3-4134-871b-be0dc4f691c4/73691554263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2f838e-1766-466a-97a1-98c8dd8f98ea/39243634460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2770/9597/files/nova_4410_poisoned_water_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1567/5293/files/jaxunevedakitusiju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/quadratic_function_general_form_to_factored_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9261/6388/files/29128275660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9133/6609/files/79683216909.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 5096 bytes
SHA-256: 5bd2c853269dda19e027a1c822db8d2b64643582cd915cb78343e7e0a4406b4e
font_01_sfnt_off000082e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E0 10792 bytes
SHA-256: 3a112cb6c0a2ae9ac834ba7dcae04d07b38c4430f4ec9084f874691fc2f6b76b
font_02_sfnt_off0000a7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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